SR4220SMT

The Datakey Electronics SR4220SMT is a board-mount receptacle designed for surface-mount technology (SMT) with a right-angle, board-edge configuration. It mates with Datakey SlimLine, Extended SlimLine, NFX, and RUGGEDrive memory tokens.

This receptacle features corrosion-resistant, gold-dot contacts that are rated for a minimum of 50,000 insertion and removal cycles. A wiping mechanism is incorporated to clear debris from the token's contacts during each insertion or removal. It also includes a detent mechanism for tactile and audible confirmation of token engagement and a Last-On/First-Off (LOFO) contact for detecting token insertion or removal.

Key specifications include a contact resistance of 100 mΩ at the beginning of life and 500 mΩ at the end of life. The operating temperature range is -40°C to +85°C, with a storage temperature range of -40°C to +105°C. Insertion force is between 0.4 kgf and 2 kgf, and removal force is between 0.3 kgf and 2 kgf. The receptacle is designed to withstand non-operating vibration of 15 g across three axes.

The SR4220SMT is suitable for reflow oven processes and can be pick-and-placed from its tray. It is a modification of the SR4210 series, with the mounting flange removed for space savings, requiring careful design considerations for mounting to avoid excessive stress on the leads.